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Questions - fragment-shader

how to create an array of vec2 and pushing to it?

I am trying to create an empty array of vec2 in fragment shader. also what are the syntax for getting the length and pushing vec2 to the array?
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Tuan Le

arrays

glsl

fragment-shader

Votes: 0

Answers: 1

Latest Answer

You cannot "push" values to and array in GLSL. The size of the array cannot be changed. All you can do is create an array of constant size and use an extra variable that tells you how many v...
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Rabbid76

OpenGL: how to pass vertex pos from Geometry shader to fragment shader?

I am currently learning shaders in OpenGL and finished writing my "drawText" geometry shader, so I can draw dynamic text ( content change every frame ), without recreating VBO every frame. I...
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SebKun

opengl

fragment-shader

geometry-shader

Votes: 0

Answers: 1

Latest Answer

The position of a vertex to be sent to the rasterizer, as defined through gl_Position, contains 4 components. Always. And the meaning of those components is defined by the rasterizer and the OpenGL re...
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Nicol Bolas

Is there a way to calculate dFdx(dFdx()) of something within a fragment shader?

So I already know that the documentation for dFdx, dFdy, and fwidth states that "expressions that imply higher-order derivatives such as dFdx(dFdx(n)) have undefined results, as do mixed-order de...
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Andy Qu

glsl

shader

fragment-shader

threejs-editor

Votes: 0

Answers: 1

Latest Answer

Perhaps there is a way to manually take information from neighboring fragments? Even if you could (and with some subgroup extensions, you can), it wouldn't help. Fragment shaders execute invocations...
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Nicol Bolas

GLSL How to make input channel in the center of screen, whatever screen size is

I'm trying to make the input channel (London picture) in the center of the screen, the issue here is I don't want to change 0.5 to make the picture in the center, because if the screen changed, I need...
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heromimox

glsl

shader

fragment-shader

Votes: 0

Answers: 1

Latest Answer

The screen and texture co-ordinates in GLSL don't change with the size of the image: they always range from -1 to +1 (for the screen) and 0 to 1 (for textures). So 0.5 is always correct for an image 1...
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Andrea

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